LOGO! functions

4.4 Special functions list - SF

4.4.17Threshold trigger

Short description

The output is set and reset with two configurable threshold triggers.

Symbol in LOGO!

Wiring

Description

 

 

Input Fre

The function counts the 0 to 1 transitions at input Fre.

)UH

 

 

1 to 0 transitions are not counted.

4

 

Use

3DU

 

 

 

 

 

 

• inputs I3, I4, I5, I6 for fast counting (only LOGO!

 

 

 

12/24RC/RCo, LOGO! 12/24RCE, LOGO! 24/24o

 

 

 

and LOGO! 24C/24Co): max. 5 kHz, if the fast

 

 

 

input is directly connected to the threshold trigger

 

 

 

function block

 

 

 

• any other input or circuit component for counting

 

 

 

low frequency signals (typ. 4 Hz).

 

 

 

 

 

 

Parameter

On: On threshold

 

 

 

Range of values:

 

 

 

0000...9999

 

 

 

Off: Off threshold

 

 

 

Range of values:

 

 

 

0000...9999

 

 

 

G_T: Time interval or gate time during which the input

 

 

 

pulses are measured.

 

 

 

Range of values:

 

 

 

00:00 s...99:99 s

 

 

Output Q

Q is set and reset at the thresholds.

Parameter G_T

The gate time G_T can be provided by the actual value of another already-programmed function. You can use the actual values of the following functions:

●Analog comparator (Page 218) (actual value Ax – Ay)

●Analog threshold trigger (Page 213) (actual value Ax)

●Analog amplifier (Page 226) (actual value Ax)

●Analog multiplexer (Page 248) (actual value AQ)

●Analog ramp (Page 251) (actual value AQ)

●Mathematic instruction (Page 265) (actual value AQ)

●PI controller (Page 256) (actual value AQ)

●Up/down counter (Page 201) (actual value Cnt)

 

LOGO!

210

Manual, 04/2011, A5E03556174-01

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Image 210
Siemens 6ED1050-1AA00-0BE8 manual Threshold trigger, Parameter GT
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